Как определить, что тип анонимный?

var type =new {id = 5, s = "sss"}.GetType();
type.???

private static bool CheckIfAnonymousType(Type type)
{
    if (type == null)
        throw new ArgumentNullException("type");
 
    // HACK: The only way to detect anonymous types right now.
    return Attribute.IsDefined(type, typeof(CompilerGeneratedAttribute), false)
        && type.IsGenericType && type.Name.Contains("AnonymousType")
        && (type.Name.StartsWith("<>") || type.Name.StartsWith("VB$"))
        && (type.Attributes & TypeAttributes.NotPublic) == TypeAttributes.NotPublic;
}

public static bool IsAnonymous(this Type type)
{
    if (type == null)
        throw new ArgumentNullException("type");
 
    // HACK: The only way to detect anonymous types right now.
    return Attribute.IsDefined(type, typeof(CompilerGeneratedAttribute), false)
        && type.IsGenericType && type.Name.Contains("AnonymousType")
        && (type.Name.StartsWith("<>") || type.Name.StartsWith("VB$"))
        && (type.Attributes & TypeAttributes.NotPublic) == TypeAttributes.NotPublic;
}

var type =new {id = 5, s = "sss"}.GetType();
bool anonim = type.IsAnonymous();